From 08b90f0655258411a1b41d856331e20e7ec8d55c Mon Sep 17 00:00:00 2001 From: Alexander Shishkin Date: Tue, 20 Sep 2016 18:48:10 +0300 Subject: [PATCH] perf/x86/intel/bts: Make it an exclusive PMU Just like intel_pt, intel_bts can only handle one event at a time, which is the reason we introduced PERF_PMU_CAP_EXCLUSIVE in the first place. However, at the moment one can have as many intel_bts events within the same context at the same time as one pleases. Only one of them, however, will get scheduled and receive the actual trace data. Fix this by making intel_bts an "exclusive" PMU. Signed-off-by: Alexander Shishkin Acked-by: Peter Zijlstra Cc: Arnaldo Carvalho de Melo Cc: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Stephane Eranian Cc: Thomas Gleixner Cc: Vince Weaver Cc: vince@deater.net Link: http://lkml.kernel.org/r/20160920154811.3255-2-alexander.shishkin@linux.intel.com Signed-off-by: Ingo Molnar --- arch/x86/events/intel/bts.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/events/intel/bts.c b/arch/x86/events/intel/bts.c index 6ff66efa0feb..982c9e31daca 100644 --- a/arch/x86/events/intel/bts.c +++ b/arch/x86/events/intel/bts.c @@ -584,7 +584,8 @@ static __init int bts_init(void) if (!boot_cpu_has(X86_FEATURE_DTES64) || !x86_pmu.bts) return -ENODEV; - bts_pmu.capabilities = PERF_PMU_CAP_AUX_NO_SG | PERF_PMU_CAP_ITRACE; + bts_pmu.capabilities = PERF_PMU_CAP_AUX_NO_SG | PERF_PMU_CAP_ITRACE | + PERF_PMU_CAP_EXCLUSIVE; bts_pmu.task_ctx_nr = perf_sw_context; bts_pmu.event_init = bts_event_init; bts_pmu.add = bts_event_add; -- 2.39.2